. scientists want to analyze how the human body reacts to long-term exposure in orbit. this is part of nasa's larger plan to one day send man to mars but the journey, get this, takes eight months one way. so they must understand how the body reacts to those conditions. researchers already know it can affect eyesight. >> we discovered that some crewmembers are having some pressure in their intracain ya'll pressure, pressure in the vain system in their brains and spinal cord especially. that was causing in some crewmembers a vision impact. >> reporter: training for this mission starts early next year with the official launch date in the spring of 2015. jenna. jenna: pretty remarkable. when you think about the story, you wonder why can't we do the fiscal cliff thing? >> reporter: right. jenna: if we can put somebody in space for a year. >> reporter: we need to ask our lawmakers, right. jenna: casey, incredible story. gregg: you can put the man on the moon but you can't --. all right. researchers may have found what could be the earliest known dinosaur to walk the earth. the mysterious fossil f
